Psychometric properties of the English language version of the C-BiLLT evaluated in typically developing Canadian children.
Jael N Bootsma, Fiona Campbell, Dayle McCauley and 7 others
PMID 36847022WHAT IT FOUND
In 80 typically developing Canadian children, a computer language comprehension test gave stable scores over about three weeks and rose with age.
It can be completed using eye gaze, switches, touch, or partner scanning. In 9 children with cerebral palsy, completion was incomplete.
Key findings
01C-BiLLT-CAN scores increased with age in the typically developing sample.
02Retests within about three weeks produced an intraclass correlation of 0.96 and a standard error of measurement of 2.3 points on an 88-point score.
03In 9 children with cerebral palsy, 4 completed the C-BiLLT-CAN fully and 5 partially, and the feasibility aim was not achieved.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The C-BiLLT-CAN was validated in typically developing children, not directly in children with cerebral palsy and complex communication needs. The cerebral palsy feasibility sample was only 9 children, and data collection stopped because of COVID-19, so the feasibility aim was not achieved. The typically developing sample had above average scores on the PPVT-4, so results may not apply to children with lower language exposure or cognitive functioning. Some analyses used smaller samples because of age limits and virtual visits; Raven’s 2 results used only in-person paper scores. One typically developing child was removed after scoring zero due to distractibility, and the feasibility group included only children older than three years.
Declared interests
JG developed the C-BiLLT and is head of the C-BiLLT foundation, which trains clinicians in Europe to use the tool. Profits are used to maintain the C-BiLLT software and online platform. The study was funded by the Hamilton Academic Health Sciences Organization Innovation Grant.
The easy way to misread this
Do not conclude the C-BiLLT-CAN is validated for children with cerebral palsy and complex communication needs. The reliability and validity numbers come from 80 typically developing children, and the cerebral palsy sample had only 9 children with incomplete feasibility.